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I've seen patches that have cracked or come loose. Sometimes from user error, sometimes simply from bad luck. IR material tends to turn yellow ish over time, but it doesn't seem to affect accuracy. I tend to re-do my R Hops once a year or so to keep them looking fresh, not because of any fault in accuracy.
I have seen two R Hops done by Umbrella, both looked okay on the outside but neither was flush on the inside.
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